We've shown you before that home alarm systems don't have to be expensive. To prove that point even further over on Medium, Alex Nikolaidis shows off how to make a cheap home alarm system with a Raspberry Pi.

Your home is a place you want to keep secure, but getting all the high-end security gadgets and…
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The system is exactly what you'd expect it to be. With a Raspberry Pi and a webcam you set up motion detection to trigger events and send the video to a server. In this case, the webcam is hidden away inside a door so it can be used to see when people come by as well. When motion is detected, a notification is sent to another computer and images are uploaded to a FTP server. Head over to Medium for the full guide to making it for yourself.